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z+8=-4-z
We move all terms to the left:
z+8-(-4-z)=0
We add all the numbers together, and all the variables
z-(-1z-4)+8=0
We get rid of parentheses
z+1z+4+8=0
We add all the numbers together, and all the variables
2z+12=0
We move all terms containing z to the left, all other terms to the right
2z=-12
z=-12/2
z=-6
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